What was found
(CAN) SHORTLY AFTER TOP OF CLIMB FLIGHT CALLED TO ADVISE THAT F/OS SLIDING WINDOW WAS LEAKING, NOISE UNBEARABLE. FLIGHT DIVERTED TO YYC. WINDOW SEAL, SILL AND FRAME INSPECTED NO FAULTS DETECTED. AIRCRAFT PRESSURIZED AND NO FAULTS DETECTED. REPEAT SNAG OF NOISE FROM F/OS SLIDING WINDOW. SEAL WAS LUBED, REPEAT SNAG OF F/OS WINDOW NOISE, WINDOW SEAL REPLACED.